Data transfer control device, information storage medium and...

Details Data transfer control device, information storage medium and... Data transfer control device, information storage medium and...

2005-06-07

2005-06-07

Chin, Wellington (Department: 2664)

Multiplex communications

Network configuration determination

In a bus system

C370S254000, C370S255000

Reexamination Certificate

active

06904022

ABSTRACT:
The objective of the present invention is to provide a data transfer control device, information storage medium, and electronic equipment that can relieve the inconveniences caused whenever a reset that clears node topology information occurs. If a bus reset occurs during a data transfer period in a data transfer control device in accordance with the IEEE 1394 standard, and also the content of ORBs before and after the bus reset is the same, data transfer restarts from a resumption at the point at which the bus reset occurred, thus preventing duplicate printing in a printer. Whenever a bus reset occurs during a data transfer period, the continuation flag is set to on. The first command block ORB comprising a print command that transferred in after the bus reset is used in the comparison with the pre-bus-reset ORB. When no ACK is returned from the initiator because of a bus reset, a transition to a dead state occurs. The part of transfer data from a scanner that has not yet been transferred to the initiator at point at which the bus reset occurred is retained without being destroyed.

REFERENCES:
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U.S. Appl. No. 10/781,721, filed Feb. 20, 2004, Fujita et al.

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